Camel hump heads

But this head uses a smaller intake port to impart more lower end torque that goes with the lower gas consumption RPMs. This came at the cost of top end power, so these heads just aren't competitive with the Camel Humps unless they are professionally ported. The L31 Vortec comes out of the LT-1 and 4 reverse coolant heads of the early …

Camel hump heads. Upon changing the valve springs on these 462 camel hump heads, I noticed the shop didn't install valve seals. The valves did have that little rubber o ring however, and the springs were brand new. ... Early heads depend on the steel shield plus the rubber O-ring for oil control. The problem occurs when the shield is left off. Common practice ...

There are a lot of castings to choose from when running the Chevy Double Hump heads. In this video we discuss what is the best casting to start with for you...

148 posts · Joined 2009. #1 · Jan 12, 2010. I recently called a reputable machine shop in my area about having my sbc camel hump heads upgraded for unleaded fuel and to install 2.02 valves. I asked about installing hardened seats at the exhaust valve and he said not to waste my money. This isn't a daily driver, in fact I haven't put 1000 ...UPGRADED SBC Camel Hump Cylinder Heads 461 STAINLESS VALVES HARDENED SEATS. Opens in a new window or tab. New (Other) $1,199.99. streetrodshq (6) 100%. or Best Offer +$199.99 shipping. New Listing SBC Double Hump Camelback Head 1966 Corvette Chevy 461 Casting 1.94 62cc. Opens in a new window or tab.HELSINKI, Finland, May 5, 2021 /PRNewswire/ -- Ponsse is launching a new debarking PONSSE H7 HD Euca harvester head alongside the previously relea... HELSINKI, Finland, May 5, 2021...As already mentioned by others, there are better heads available now. Certainly Chevy's later performance heads are better, but the BEST performance SB heads are aftermarket versions. The first version of the double hump heads was the 461, which was introduced in 1961 on the 315hp/283 fuel injected (ONLY) Corvette engine.They actually ran very well. The 327-300 engine used the double hump heads, with larger 1.94" and 1.5" valve size, larger port intake manifold with larger Carter AFB carb, and larger dump ram's horn exhaust manifolds. The basic shortblocks of the two 327s were basically the same. More than likely your block number is 870.

This week, we add new valvetrain components to old “camel hump” cylinder heads. R.B. Las Vegas, NV. Q: I recently acquired a set of Chevy “camel hump” small block heads. I am putting in screw-in studs so I can use Harland Sharp roller rocker arms. Other than fitting the studs, do I need to do any machine work to the heads to use the ...I can get a set of those “camel back” or “double-hump” heads—I think the cast number is 462. This is going to be a very mild 292 in my street rod and I might even add …The “double hump” or “fuelie” heads have been around since the 1960’s. They are still used in a variety of applications. We have a good supply of used ‘186 & ‘492 heads available with everything from “ Undercover Porting ” to CNC Sportsman Porting. Stock “double hump” heads flow 202 cfm intake and 141 cfm on the exhaust.May 18, 2009 · 3991492. Jump to Latest Follow. 30K views 10 replies 7 participants last post by 2drpostL79 Aug 23, 2009. G. gregmontgomery Discussion starter. 203 posts · Joined 1999. #1 · May 18, 2009. can anyone give any info. on these heads .3991492 is the numbers are these good performance heads.thanks. Like. Oct 1, 2006 · The double hump or "camel hump" casting marks can be found on a variety of small-block iron heads and designate a high-performance casting. Many heads with the double-hump mark were installed on ...

Buy ICT Billet SBC LWP Alternator Bracket Double Hump Heads Adjustable Billet Kit Small Chevy 305 327 350 5.0L 5.7L V8 Eight Cylinder Long Water Pump Carburetor V Belt Compatible With ... Very nice kit and a must if you have camel hump heads. It mounts the alternator low and out of the way...." Read more. 18 customers …Mar 2008. Posts. 952. i think a lot of people that think that the camel humps are better simply because they flow more air or make more peak horsepower need to look at the bigger picture. the vortecs are more efficient over a broader rpm range, and require less timing and octane to get the job done.Free Shipping - Trick Flow® DHC™ 175 Cylinder Heads for Small Block Chevrolet with qualifying orders of $109. Shop Cylinder Heads at Summit Racing. $5 Off Your $100 Mobile App Purchase - Get the App. ... 291,461,462 "double hump" or "camel back" castings that customers want. To keep with the vintage design, the heads are available with 69 ...I researched the best head-porting tactics for small-block Chevy double-hump heads, and iron big-block Chevy rectangle-port heads. A quick search educated me that a set of later model Vortec heads are a better option. Additionally, I found a wealth of info on the steps necessary to improve the Vortec with minimal porting. As one online ...Step back in time with our modern reproduction of the iconic Chevy 461 double hump cylinder heads, now cast in lightweight aluminum! Also known as "fuelie" heads, the …Made from premium grade, lightweight A356-T61 aluminum, DHC™ 175 heads feature the exterior styling and straight spark plug holes that deliver the nostalgic appearance of the original factory performance 186, 291,461,462 "double hump" or "camel back" castings that customers want.

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Nov 30, 2017 · Here, hydraulic cams ruled and tach faces only read to 6,000 rpm, redlines to 5,000. But that changed in 1965. For a mere $107.60 over the base 250hp 327, the new L79 offered both Corvette ... Features like fast-burn combustion chambers, high-velocity ports, large diameter valve springs, and positive stop valve seals bring the vaunted camel hump heads into the 21st Century. Save yourself the hassles of hunting down original GM 3782461, 3782461X or 3890462 castings, only to find out they can't be saved. Jul 11, 2006 · the 462 and pretty much all the following camel hump heads had the D shaped chamber, and the spark plug location was moved with a large quench pad adjacent to it....these are the heads to use if you are going to run domed pistons, the 461's usually have some interference with domes and spark plugs. 461 View attachment 204412 462 View attachment ... 1094 posts · Joined 2008. #1 · Dec 4, 2015. I have a set of 1965 camel hump heads that have been completely redone with hardened seats and Manley stainless valves, screw in studs, guide plates. Comp cam springs. These were built at the machine shop and have been on my engine since it was new 2 yrs ago and only have 3256 miles on the motor.148 posts · Joined 2009. #1 · Jan 12, 2010. I recently called a reputable machine shop in my area about having my sbc camel hump heads upgraded for unleaded fuel and to install 2.02 valves. I asked about installing hardened seats at the exhaust valve and he said not to waste my money. This isn't a daily driver, in fact I haven't put 1000 ...These heads will also interchange with other camel hump heads with casting numbers 461, 461X, 462, 291, 292, 186, 041, 370, & 492. These heads will fit 265, 283, 302, 305, 307, 327, 350, & 400 small block Chevy engines from 1955 to 1986 with no modifications (steam holes will need to be drilled for a 400) and 1987-1999 with correct gen 1 intake ...

Buy ICT Billet SBC LWP Alternator Bracket Double Hump Heads Adjustable Billet Kit Small Chevy 305 327 350 5.0L 5.7L V8 Eight Cylinder Long Water Pump Carburetor V Belt Compatible With ... Very nice kit and a must if you have camel hump heads. It mounts the alternator low and out of the way...." Read more. 18 customers …The actual CFM flow numbers would depend on if any work was done to the heads, and the quality of the valve job I did read one test on flow #'s for a 461 (stock, untouched), the #'s were as follows: .050" 1-38.9, E-20.9Free Shipping - Trick Flow® DHC™ 175 Cylinder Heads for Small Block Chevrolet with qualifying orders of $109. Shop Cylinder Heads at Summit Racing. $5 Off Your $100 Mobile App Purchase - Get the App. ... 291,461,462 "double hump" or "camel back" castings that customers want. To keep with the vintage design, the heads are available with 69 ...Erik Beckett Discussion starter. 710 posts · Joined 2001. #1 · Jul 11, 2004. I need to install some new plugs in my 327 but I am not sure what to go with. I have the 462 camel hump heads and right now there are NGK XR5's in that are a grey color on the porcelin. This the same set that came with the car when I bought it so I need to change ...item 4 OEM GM 3782461 Cylinder Heads Small Block Chevy Camel Hump 1964 2.02 1.60 Fuelie OEM GM 3782461 Cylinder Heads Small Block Chevy Camel Hump 1964 2.02 1.60 Fuelie $895.00 +$88.85 shipping67/68 Camaro's were short water pump engines that did not require accessory holes in the heads. 69 Camaro's were long water pump engines that only required one bolt hole in the passenger side head. (even though each head had 3 drilled and tapped holes on both ends of the head. Vintage Air will set you up with brackets for either style.I know it sounds hypocritical to run a camel humps and an alternator but it will be under the hood of '55 chevy so the non traditional sins will be hidden along with the Mallory Dist. I have set of 291 casting heads with no holes 2.02/ 1.60 valves to wake up the old 350. I don't have room for the low mount so need some ideas for other options ... DHC 175 heads are made from premium grade A356-T61 aluminum and have the exterior styling and straight spark plug holes that deliver the nostalgic appearance customers want. On the inside, 60cc CNC-profiled combustion chambers with blended bowl machining under the valves and small cross-section intake runners promote low-RPM torque increases ... The problem with adding bigger fuelie style cylinder heads like the 461 or 462 is that, while these heads increase airflow over a stock 283 head, this also increases the combustion chamber volume. Those double-hump heads generally have 64cc chambers. The stock 283 used a 58cc chamber.

DHC 175 heads are made from premium grade A356-T61 aluminum and have the exterior styling and straight spark plug holes that deliver the nostalgic appearance customers want. On the inside, 60cc CNC-profiled combustion chambers with blended bowl machining under the valves and small cross-section intake runners promote low-RPM torque increases ...

10034 posts · Joined 2003. #2 · Jun 12, 2006. That was pretty much the hot setup back in the mid 70's. I had ran 350 motors with both the 327/350 cam and the 350/350 (L82) cam. L82 cam is good for about 5800-6000 RPM and a minimum of 9.0/1 CR. It will work with a stock stall converter but comes alive with a 2400+ stall conv.Re: camel hump vs vortec. by ProPower engines » Tue Oct 13, 2020 7:50 pm. No comparison. The vortec heads are better in every way unless you have free double bump heads and have to pay for the vortec's. If you flow the early GM heads and flow the vortec heads and compare the numbers. The big difference is in the chamber shape.Chevy Small Block Alternator Bracket - Fuelie or Camel Hump Heads with Long Water Pump (LWP) (283, 302, 327, 305, 350 & 400 CID) Mid-mount Chevy small block alternator bracket for V-belt applications with Fuelie heads that do not have bolt holes in the front of the cylinder head. Designed for use with OEM or CVF Racing pulleys.Nov 30, 2021 · I started a build of a SJ 327 block with an older aftermarket 3.48” SJ crank. I was going to run it in my 57 with ported aluminum speedway motors camel hump heads, modified to take a staggered valve cover, and a heavily worked factory intake. I was hoping to squeak into the 12s with it. Doesn't the double hump head family run outta steam above about a .450" to .500" lift b/c they weren't meant to run much above .447", (-151 cam), or .456", (-346 cam)? ... Deshrouding or unshrouding refers to opening up the heads combustion chamber wall near the intake valve. If you upgrade the heds to 2.02 valves from 1.94s and don't do this ...Re: camel hump vs vortec. by ProPower engines » Tue Oct 13, 2020 7:50 pm. No comparison. The vortec heads are better in every way unless you have free double bump heads and have to pay for the vortec's. If you flow the early GM heads and flow the vortec heads and compare the numbers. The big difference is in the chamber shape.Look for last 3 numbers, example 461, Casting number 3767462 identifies Camel Back heads on 327 engines in 1962 to 1967 GM models. Number 3782461 is found on heads on the 1964 to 1967 models equipped with the 327. Number 3917291 can be found on the 302, 327 and 350 engines in 1967 to 1969 models. Number 3927186 is …17921 posts · Joined 2007. #5 · Jul 17, 2020 (Edited) For the most part aftermarket heads come ready to accept both the 1955-86 head's intake bolt pattern and the 1996-2002 Vortec pattern. The real oddball is the 1987-95 pattern that looks like the 55-86 pattern but uses a different angle on the plenum bolts.Aluminum GM 3782461 Chevy 327 SBC Camel Back / Double Hump Cylinder Head Bare Opens in a new window or tab 283, 302, 307, 327, 350, 383, Bare Cylinder Head StyleBecause camel humps store food, the dromedaries need other ways to cope with water scarcity. For example, camels can can drink up to 30 gallons (114 liters) of water in one sitting, they excrete ...

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The Vortec heads do flow better than the camel backs heads. The only thing is that with the added cost of an intake and valve covers, the swap can get to the cost of a set of Dart or RHS heads. RHS also offers their Pro-torker line of heads that are the same 170cc intake runners, but with the old bolt patterns !Free Shipping - Trick Flow® DHC™ 175 Cylinder Heads for Small Block Chevrolet with qualifying orders of $109. Shop Cylinder Heads at Summit Racing. $5 Off Your $100 Mobile App Purchase - Get the App. ... 291,461,462 "double hump" or "camel back" castings that customers want. To keep with the vintage design, the heads are available with 69 ...I'm sure you will get a more technical response for this but "camel hump" heads are named primaraly for the embossed shape in front of the head where your accessories. would bolt up too. Back in the day they were sought after hi -po hp. heads that were. closed chambered large valve small block heads.I never saw one side with the camel hump and one side with a triangle on top. Tory ACES Member #1890 Team Chevelle Gold #288 1955 Chevrolet Bel Air Unrestored 15,000 Mile Survivor ... I've seen that before on numerous heads. One hump, one triangle. Definitely different than a double-hump. I never did look at the casting …stinger460. lets not scare the man. 400 sbc's can be cooled and not over heat on the street. here's how. drill steam holes in those heads if you really plan on using them. also while having the heads off time to do some plumbing. on the block between the two center bore there is a plug in the water jacket on each side. remove them, then coming ...Accessory holes in the heads did not come about until 1969. This was also the first year of the long style water pump. If you keep everything stock on your 1967, it is all stock parts for a '67 with the "short" water pump. Many parts houses can set you up with what you need. 69 Camaro -originally a LM1 car. 327, Edelbrock E-streets, hooker, DUI ...Accessory holes in the heads did not come about until 1969. This was also the first year of the long style water pump. If you keep everything stock on your 1967, it is all stock parts for a '67 with the "short" water pump. Many parts houses can set you up with what you need. 69 Camaro -originally a LM1 car. 327, Edelbrock E-streets, hooker, DUI ...General Motors identifies its small-block Chevy cylinder heads with both casting numbers and casting marks. "Double-hump" heads were found on many of its high-performance engines in the 1960s and early 1970s. They were manufactured with larger intake and exhaust port volumes and valves for the period, and engines equipped with them had … ….

7793 posts · Joined 2001. #4 · Jun 18, 2009. The biggest problem that I see with the double hump heads is that the intake port is too small with the new cams and "bigger" carbs. etc. If you build the engine just as chevrolet did, then you should be ok. You want lots of compression and a small cam.Accessory holes in the heads did not come about until 1969. This was also the first year of the long style water pump. If you keep everything stock on your 1967, it is all stock parts for a '67 with the "short" water pump. Many parts houses can set you up with what you need. 69 Camaro -originally a LM1 car. 327, Edelbrock E-streets, hooker, DUI ...Features like fast-burn combustion chambers, high-velocity ports, large diameter valve springs, and positive stop valve seals bring the vaunted camel hump heads into the 21st Century. Save yourself the hassles of hunting down original GM 3782461, 3782461X or 3890462 castings, only to find out they can't be saved.Dec 8, 2005 · 041s ARE double-humps. Some of the casting numbers you see the most are 461 (no bolt holes), 462, 492, 186, 041, 041X, 291 (no bolt holes), 292 (over-the-counter GM race head) Those used to be the heads we all ran, for years and years, back before CNC casting made possible the whole aftermarket head industry as we know it. 041s ARE double-humps. Some of the casting numbers you see the most are 461 (no bolt holes), 462, 492, 186, 041, 041X, 291 (no bolt holes), 292 (over-the-counter GM race head) Those used to be the heads we all ran, for years and years, back before CNC casting made possible the whole aftermarket head industry as we know it.Old camel hump 461 heads wich cam? My old 327 died on my last week but I have bought a 350 now, its a standard 3970010 block from 72 with original heads, I'm thinking of taking my 461 heads from the 327 and put them on, but wich cam to choose? You'll need to talk with a rep from either COMP CAMS or Lunati to find the best cam for your combination.Back to your original question, most people call the "camel hump" heads fuelies but as stated before, only the 461 were true fuelies. There are several closed chambered heads with different casting numbers and markings that will perform as well and a original fuelie head. You need to get the last 3 numbers from the casting numbers and look them up.1094 posts · Joined 2008. #1 · Dec 4, 2015. I have a set of 1965 camel hump heads that have been completely redone with hardened seats and Manley stainless valves, screw in studs, guide plates. Comp cam springs. These were built at the machine shop and have been on my engine since it was new 2 yrs ago and only have 3256 miles on the motor.Doesn't the double hump head family run outta steam above about a .450" to .500" lift b/c they weren't meant to run much above .447", (-151 cam), or .456", (-346 cam)? ... Deshrouding or unshrouding refers to opening up the heads combustion chamber wall near the intake valve. If you upgrade the heds to 2.02 valves from 1.94s and don't do this ... Camel hump heads, Camel hump heads. Good evening to all. I am finally back into hotrodding, and have a couple of questions for whoever can answer them. I have a '59 El Camino that my uncle put a 327 in from a 1965 impala. I have since pulled the engine out and I am begining the rebuilding process. I noticed that the heads had the unique camel hump stamped on the ..., 28 posts · Joined 2008. #1 · Dec 18, 2008. I've got a bare set of camel hump heads with casting number 3782461 and 1.94 valves. They are not drilled in the front for brackets and have no cracks. I bought these heads in 1987 for a song and I've kept them for all this time planning to use them one day. I keep reading about all the great …, I have acquired a freshly rebuilt set of 291 double hump heads with what seems like 2.02 intake valves, and a 400ci 511 block that is allegedly 0.040 over already. All for $0.00 mind you. I'm currently building a 305/nv3500 powered 1984 Ford Ranger, just a weekend toy, probably never going to see the strip but once or twice when i get a wild hair., Im trying to find out if these would be good heads for a 350 buildup. the 461 heads are very nice heads, but the vortec is a little better performance wise. comp. varies depending upon head gasket used and how far down in the hole your pistons are, and if flat top or domed or dished. sam-missle. Like. D., Jun 1, 2009 · If you find a set that are ready to go and need no work, they are a good head. With port work, 2.02/5 & 1.60 pro flow valves they can be a great head. Now if you do this and the cost of all the machine work and parts. A STK Vortec head for under 600.00 a pair will greatly out perform these heads. , Mar 9, 2003 · Camel Hump Heads Long ago, and I mean long ago, I knew all this stuff by memory. I believe the first camel hump head was on the 250HP or 275HP 327. Those heads had the 1.94 intakes. The 2.02's must have been on the 350HP or 365HP, and of course the Fuelies. I used to read Popular Hot Rod religiously and they had a project called Project X, a ... , Step back in time with our modern reproduction of the iconic Chevy 461 double hump cylinder heads, now cast in lightweight aluminum! Also …, Dear Lifehacker,, Chevy Camel Hump Heads. howaus_mw3a7d5 (7) Seller's other items Seller's other items; Contact seller; US $2,600.00. No Interest if paid in full in 6 mo on $99+ with PayPal Credit * ... Cylinder Heads & Parts for Chevy, Cylinder Heads & Parts for Chevrolet Chevy II, Engines for Chevy,, Nov 25, 2001 · The actual CFM flow numbers would depend on if any work was done to the heads, and the quality of the valve job I did read one test on flow #'s for a 461 (stock, untouched), the #'s were as follows: .050" 1-38.9, E-20.9 , For instance, the camel hump symbol (also called double hump) can be found on 461, 461X, 462, and 291 casting heads. The 492, 292, and 186 heads have a slightly different looking camel hump. These heads may have come with 1.94/1.5-inch valves or they might have been made with 2.02/1.6-inch valves., Because camel humps store food, the dromedaries need other ways to cope with water scarcity. For example, camels can can drink up to 30 gallons (114 liters) of water in one sitting, they excrete ..., 10034 posts · Joined 2003. #2 · Jun 12, 2006. That was pretty much the hot setup back in the mid 70's. I had ran 350 motors with both the 327/350 cam and the 350/350 (L82) cam. L82 cam is good for about 5800-6000 RPM and a minimum of 9.0/1 CR. It will work with a stock stall converter but comes alive with a 2400+ stall conv., HELSINKI, Finland, May 5, 2021 /PRNewswire/ -- Ponsse is launching a new debarking PONSSE H7 HD Euca harvester head alongside the previously relea... HELSINKI, Finland, May 5, 2021..., 962 posts · Joined 2004. #2 · Mar 22, 2009 (Edited) 383 with camel hump heads. You're going to be up there on the compression ratio, and Hi-Test fuel will be a requirement. Be sure and get your "quench" set right from the start, somewhere in the area of .035 to .045. 7., The new heads will out perform the camel humps with ease. With the prices of new heads these days there is no reason to run 30 year old technology, unless you race in a class that has restrictions. Sure if you could get a deal like a set of camel humps already updated for about $300-$350 that would be a good deal., Made from premium grade, lightweight A356-T61 aluminum, DHC 175 heads feature the exterior styling and straight spark plug holes that deliver the nostalgic appearance of the original factory performance 186, 291, 461, 462 "double hump" or "camel back" castings that customers want. 60cc CNC-profiled combustion chambers combined with a state of ..., (Kitco News) - Kitco aficionados, it is now time to have your say in where you think gold prices are heading in the short-term.Read more on 'Kitco' Indices Commodities Currencies S..., Offered in 69-71, on high performance 350's, and as a service replacement for the 64cc heads. Basically the same as the 186/041, and supposedly still available at your local chevy dealer, under different p/n's. Later castings offered 1.44" diameter spring seats, and thicker spring seats., Sometimes we all need to rest our weary head, take pause and simply sit for a moment. It may not look pretty. We may look a mess. But, we are... Edit Your Post Published by Hang in..., Learn about the new aluminum double hump cylinder heads for the small block Chevy V8 that offer improved performance and vintage look. See how they differ …, 36 posts · Joined 2002. #9 · Mar 27, 2005. i am running the double hump heads, slightly ported and polished with an rpm air gap intake and the xe274 cam. noticable lumpy idle but not too bad...combination works very well and power comes on around 2500 rpm and pulls hard well past 6000. would recommend the combination to anyone...you …, The #462 has got the normal approx. 64cc chamber and the #461 (x) has got a bit smaller one with approx. 60,5cc. Just as Scooter said. So with the same pistons you get more compression (=power or problems... with the #461 (x) heads. Bryan, you said you´ve got #292 heads there., stinger460. lets not scare the man. 400 sbc's can be cooled and not over heat on the street. here's how. drill steam holes in those heads if you really plan on using them. also while having the heads off time to do some plumbing. on the block between the two center bore there is a plug in the water jacket on each side. remove them, then coming ..., There are a lot of castings to choose from when running the Chevy Double Hump heads. In this video we discuss what is the best casting to start with for you..., Using the cam specs (specifically the intake valve closing angle) and your engine’s static compression ratio, you can determine Dynamic Compression Ratio (DCR). However, if a high static compression number, such as 10.5:1, is required to get a decent DCR number (like 7.8:1), you will more than likely end up with pre-ignition at RPMs above ..., Dromedary camels have one hump, while Bactrian camels have two humps. Dromedaries live in the deserts of the Middle East and north Africa. Bactrian camels live in northeastern Asia..., For instance, the camel hump symbol (also called double hump) can be found on 461, 461X, 462, and 291 casting heads. The 492, 292, and 186 heads have a slightly different looking camel hump. These heads may have come with 1.94/1.5-inch valves or they might have been made with 2.02/1.6-inch valves. The head casting number, 3991493, is …, Oct 7, 2013 · This week, we add new valvetrain components to old “camel hump” cylinder heads. R.B. Las Vegas, NV. Q: I recently acquired a set of Chevy “camel hump” small block heads. I am putting in screw-in studs so I can use Harland Sharp roller rocker arms. Other than fitting the studs, do I need to do any machine work to the heads to use the ... , Camels are able to survive in the desert because their humps store fat that can provide energy for up to several weeks. Camels can survive without water for several weeks because t..., Camel back, double hump,fuelie heads, are all names for 461,462 & 291 head castings, and I think they WILL work on a 305. If I'm not mistaken, they would lower your compression ratio, though. I think 305 heads have 58CC combustion chambers, and the above named heads have 62-65 CC combustion chambers. I woud imagine that the intake runners on ..., This week, we add new valvetrain components to old “camel hump” cylinder heads. R.B. Las Vegas, NV. Q: I recently acquired a set of Chevy “camel hump” small block heads. I am putting in screw-in studs so I can use Harland Sharp roller rocker arms. Other than fitting the studs, do I need to do any machine work to the heads to use the ..., For instance, the camel hump symbol (also called double hump) can be found on 461, 461X, 462, and 291 casting heads. The 492, 292, and 186 heads have a slightly different looking camel hump. These heads may have come with 1.94/1.5-inch valves or they might have been made with 2.02/1.6-inch valves.